Transformerless 12v Dc Power Supply Circuit

A transformerless power supply basically translates a high voltage ac into a desirable dc voltage without the use of a transformer.

Transformerless 12v dc power supply circuit.

This is a transformerless power supply for low current applications. A zener can be used in the output to get regulated dc. The main component of a transformerless power supply circuit is a voltage dropping capacitor or x rated capacitor which is specially designed for ac lines. D1 d4 rectifies ac to dc and c2 removes ripples.

R1 is the bleeder to remove stored current in ac when power is off. Each time i intend to use transformerless power supply to power microcontroller 8051 atmega328p and even a dc fan of 12v 1 4a i notice that they never get powered even though the power supply has been tested to produce the required 12v or 5v dc as the case may be. Transformerless power supply circuit diy project syed saad hasan 1 354 views 3 months ago designing efficient power supplies are a major concern of today s electronics as one of the main issues in modern day electronics is to efficiently generate low voltage dc from an ac source such as a wall outlet to power any circuit. If a circuit requires very low current of a few milliamperes transformerless power supply is an ideal solution.

Generating low voltage dc from the 220v or 110v ac mains is very useful and necessary in the field of electronics. C1 is the x rated ac capacitor that reduces high volt ac. R2 limits inrush current. Before designing a transformerless power supply some facts about ac dropping through a capacitor or resistor are to be considered.